bsnes/nall/memory.hpp

163 lines
5.5 KiB
C++

#pragma once
#include <nall/algorithm.hpp>
#include <nall/stdint.hpp>
namespace nall { namespace memory {
template<typename T = uint8_t> inline auto allocate(uint size) -> T*;
template<typename T = uint8_t> inline auto allocate(uint size, const T& value) -> T*;
template<typename T = uint8_t> inline auto resize(void* target, uint size) -> T*;
inline auto free(void* target) -> void;
template<typename T = uint8_t> inline auto compare(const void* target, uint capacity, const void* source, uint size) -> int;
template<typename T = uint8_t> inline auto compare(const void* target, const void* source, uint size) -> int;
template<typename T = uint8_t> inline auto icompare(const void* target, uint capacity, const void* source, uint size) -> int;
template<typename T = uint8_t> inline auto icompare(const void* target, const void* source, uint size) -> int;
template<typename T = uint8_t> inline auto copy(void* target, uint capacity, const void* source, uint size) -> T*;
template<typename T = uint8_t> inline auto copy(void* target, const void* source, uint size) -> T*;
template<typename T = uint8_t> inline auto move(void* target, uint capacity, const void* source, uint size) -> T*;
template<typename T = uint8_t> inline auto move(void* target, const void* source, uint size) -> T*;
template<typename T = uint8_t> inline auto fill(void* target, uint capacity, const T& value = {}) -> T*;
template<typename T> inline auto assign(T* target) -> void {}
template<typename T, typename U, typename... P> inline auto assign(T* target, const U& value, P&&... p) -> void;
template<uint size, typename T = uint64_t> inline auto readl(const void* source) -> T;
template<uint size, typename T = uint64_t> inline auto readm(const void* source) -> T;
template<uint size, typename T = uint64_t> inline auto writel(void* target, T data) -> void;
template<uint size, typename T = uint64_t> inline auto writem(void* target, T data) -> void;
}}
namespace nall { namespace memory {
//implementation notes:
//memcmp, memcpy, memmove have terrible performance on small block sizes (FreeBSD 10.0-amd64)
//as this library is used extensively by nall/string, and most strings tend to be small,
//this library hand-codes these functions instead. surprisingly, it's a substantial speedup
template<typename T> auto allocate(uint size) -> T* {
return (T*)malloc(size * sizeof(T));
}
template<typename T> auto allocate(uint size, const T& value) -> T* {
auto result = allocate<T>(size);
if(result) fill<T>(result, size, value);
return result;
}
template<typename T> auto resize(void* target, uint size) -> T* {
return (T*)realloc(target, size * sizeof(T));
}
auto free(void* target) -> void {
::free(target);
}
template<typename T> auto compare(const void* target, uint capacity, const void* source, uint size) -> int {
auto t = (int8_t*)target;
auto s = (int8_t*)source;
auto l = min(capacity, size) * sizeof(T);
while(l--) {
auto x = *t++;
auto y = *s++;
if(x != y) return x - y;
}
return 0;
}
template<typename T> auto compare(const void* target, const void* source, uint size) -> int {
return compare<T>(target, size, source, size);
}
template<typename T> auto icompare(const void* target, uint capacity, const void* source, uint size) -> int {
auto t = (int8_t*)target;
auto s = (int8_t*)source;
auto l = min(capacity, size) * sizeof(T);
while(l--) {
auto x = *t++;
auto y = *s++;
if(x - 'A' < 26) x += 32;
if(y - 'A' < 26) y += 32;
if(x != y) return x - y;
}
return 0;
}
template<typename T> auto icompare(const void* target, const void* source, uint size) -> int {
return icompare<T>(target, size, source, size);
}
template<typename T> auto copy(void* target, uint capacity, const void* source, uint size) -> T* {
auto t = (uint8_t*)target;
auto s = (uint8_t*)source;
auto l = min(capacity, size) * sizeof(T);
while(l--) *t++ = *s++;
return (T*)target;
}
template<typename T> auto copy(void* target, const void* source, uint size) -> T* {
return copy<T>(target, size, source, size);
}
template<typename T> auto move(void* target, uint capacity, const void* source, uint size) -> T* {
auto t = (uint8_t*)target;
auto s = (uint8_t*)source;
auto l = min(capacity, size) * sizeof(T);
if(t < s) {
while(l--) *t++ = *s++;
} else {
t += l;
s += l;
while(l--) *--t = *--s;
}
return (T*)target;
}
template<typename T> auto move(void* target, const void* source, uint size) -> T* {
return move<T>(target, size, source, size);
}
template<typename T> auto fill(void* target, uint capacity, const T& value) -> T* {
auto t = (T*)target;
while(capacity--) *t++ = value;
return (T*)target;
}
template<typename T, typename U, typename... P> auto assign(T* target, const U& value, P&&... p) -> void {
*target++ = value;
assign(target, forward<P>(p)...);
}
template<uint size, typename T> auto readl(const void* source) -> T {
auto p = (const uint8_t*)source;
T data = 0;
for(uint n = 0; n < size; n++) data |= T(*p++) << n * 8;
return data;
}
template<uint size, typename T> auto readm(const void* source) -> T {
auto p = (const uint8_t*)source;
T data = 0;
for(int n = size - 1; n >= 0; n--) data |= T(*p++) << n * 8;
return data;
}
template<uint size, typename T> auto writel(void* target, T data) -> void {
auto p = (uint8_t*)target;
for(uint n = 0; n < size; n++) *p++ = data >> n * 8;
}
template<uint size, typename T> auto writem(void* target, T data) -> void {
auto p = (uint8_t*)target;
for(int n = size - 1; n >= 0; n--) *p++ = data >> n * 8;
}
}}